76
Q:

From the following pairs, find the one which is correctly matched?

 

A) Scurvy- Thiamine B) Tuberculosis- ATS
C) Tetanus- BCG D) Malaria- Chloroquine

Answer:   D) Malaria- Chloroquine



Explanation:

Chloroquine is a medication used to prevent and to treat malaria.

Subject: Biology
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Q:

Which of the following statements about ddntps is true?

A) They have a hydrogen at the 3’ carbon of the sugar. B) DNA polymerase can add a new dNTP to a 3’ ddNTP.
C) They have a free 3’-hydroxyl group on the ribose sugar. D) They have an oxygen at the 2’ carbon of the ribose sugar.
 
Answer & Explanation Answer: A) They have a hydrogen at the 3’ carbon of the sugar.

Explanation:

ddNTPs - Dideoxynucleotides and abbreviated as ddNTPs.

 

They are chain-elongating inhibitors of DNA polymerase, used in the Sanger method for DNA sequencing.

 

They have a hydrogen at the 3’ carbon of the ribose sugar.

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3 4137
Q:

What organelle allows some protists to detect light?

Answer

An organelle called Eyespot allows some protists to detect light. It allows the cells to sense light direction and intensity and respond to it by swimming either towards the light (positive phototaxis) or away from the light (negative phototaxis).


 


Eyespot is a photoreceptive organelle found in the flagellate or (motile) cells of green algae and other unicellular photosynthetic organisms such as euglenids.


 


Eyespot-mediated light perception helps the cells in finding an environment with optimal light conditions for photosynthesis. Eyespots are the simplest and most common "eyes" found in nature, composed of photoreceptors and areas of bright orange-red pigment granules.

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4 3521
Q:

Which best describes genetic mutations?

A) Genetic mutations that cause diseases are always passed on to offspring. B) Some inherited genetic mutations can be good for the offspring.
C) Different genetic mutations cause few forms of cancer. D) Somatic mutations can be inherited from parents or acquired during life.
 
Answer & Explanation Answer: B) Some inherited genetic mutations can be good for the offspring.

Explanation:

Mutations are accidents in the copying of DNA. A genetic mutation is a random change in the DNA that is passed on further generations of cells and or organisms. 

 

Genetic mutations are accidental changes in the DNA in the germ cells or early in the formation of the embryo. These changes if they are in the germ cell will be passed on to other organisms formed by sexual reproduction or asexual reproduction. An example would be the golden delicious apple. A lost of genetic information due to a mutation resulted in a different color of fruit.

 

Genetic mutations that cause diseases are not always passed on to offspring. 

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3 4932
Q:

Which of the following vitamin helps in clotting of blood?

A) Vitamin K B) Vitamin D
C) Vitamin B1 D) Vitamin B2
 
Answer & Explanation Answer: A) Vitamin K

Explanation:

Vitamin K helps in clotting of blood. It is used by the body to help blood clot.

 

Warfarin (Coumadin) is used to slow blood clotting. By helping the blood clot, vitamin K might decrease the effectiveness of warfarin (Coumadin).

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3 7665
Q:

One reason the skeletal system is important is because

A) the skeletal system creates the connective tissue and tendons that allow the body to move B) the skeletal system is responsible for controlling functions of the entire body
C) without the skeletal system, an individual would not have enough calcium to live D) the skeletal system is solely responsible for housing the body's immune system
 
Answer & Explanation Answer: A) the skeletal system creates the connective tissue and tendons that allow the body to move

Explanation:

One reason the skeletal system is important is because the skeletal system creates the connective tissue and tendons that allow the body to move.

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6 5969
Q:

What is the functional unit of a skeletal muscle called?

A) Myofibril B) Sarcomere
C) Fiber D) Fasciculus
 
Answer & Explanation Answer: B) Sarcomere

Explanation:

The myofibrils are composed of actin and myosin filaments, repeated in units called sarcomeres, which are the basic functional units of the skeletal muscle.

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2 2678
Q:

Why are yeast cells frequently used as hosts for cloning?

A) they are eukaryotic cells B) they do not have plasmids
C) only yeast cells allow the gene to be cloned D) they easily form colonies
 
Answer & Explanation Answer: A) they are eukaryotic cells

Explanation:

If you were to produce a protein in bacterial cloning systems, you would not get the same post transcriptional and post translational modifications because the prokaryotic and eukaryotic systems work differently on the modifications.

Thus human recombinant protein genes are usually cloned in yeast cells. Also since they have a short generation time, they can be easily culture.

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4 3822
Q:

Basophils increase in number when parasitic invasion occurs.

A) TRUE B) FALSE
Answer & Explanation Answer: B) FALSE

Explanation:

FALSE. Basophils number will not be increased when parasitic invasion occurs.


 


Basophils are a type of white blood cell. Although they're produced in the bone marrow, they're found in many tissues throughout your body. They're part of your immune system and play a role in its proper function.


 


Basophils appear in many specific kinds of inflammatory reactions, particularly those that cause allergic symptoms. If your basophil level is low, it may be due to a severe allergic reaction.


 


Basophils contain anticoagulant heparin, which prevents blood from clotting too quickly. They also contain the vasodilator histamine, which promotes blood flow to tissues.


 

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2 2692